Lens holder for use in lens grinding



Mar. 13, 1923.

H. w. HILL LENS HOLDER FOR USE IN LENS GRIIiDING Filed Aug. 23, 1920INVENTOR HARRY w HILL BY Marga ATTORNEYS Fatented Mar. 13, 1923.

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I-IARRY W. HILL, 0F SOUTI-IBRIDGE, MASSACHUSETTS, ASSIGNORKTO'AIVIERIGANOPTICAL COMPANY, OI SOUTI-IBEIDGE, MASSACHUSETT SpA V O L.U1\TTARYASSO0115331015" OF MASSACHUSETTS.

Lens HOLDEB'FOR USE IN invs enrnn ne Application fi led August 23, 1920,Serial No. 405,302.

To all whom it may concern:

Be it known that I, HARRYWVJIIILL, a citiZen of th'e United States,residing at Southbri'dge, in the county of IVorceste'rand State ofMassachusetts, have invented certain'new and useful Improvements in Lens'Holders for Use in'Lens Grinding, of which the following is aspecification.

This invention relates to improvements in grinding machinery and hasparticular reference to machinery adapted for use in V the constructionof ophthalmic lenses.

It is, th'ereforefthe object of my present invention toprovide a. noveland improved construction of lensblock or holder adapted to .receive andproperly retainfaplurality --of lenses without the necessity of makinguse of pitch or other adhesive.

A further objectgo-f the inventipn is the provision of a. device whichwill hold the several lenses in exact predetermined position and inpredetermined relationship one to the other so that accurate grinding ofthe several lenses to proper thickness may be accomplished.

A further object of the present invention is the provision of a deviceof this character in which the lens shall be firmly sup ported andliability of springing of the glass and thus of production of impropersurfaces thereon eliminated.

Other objects and advantages of my improved construction should bereadily apparent by reference to the following specifications taken inconnection with the accompanying drawings, and it will be understoodthat I may make any modifications in the specific details ofconstruction shown and described within the scope of the appended claimswithout departing from or exceeding the spirit of my invention.

Figure I represents a view of a lens grinding machine embodying myimprovements.

Figure II represents an enlarged plan view of the block.

Figure III represents a bottom view of the block with the lens inposition;

Figure IV represents a sectional view taken as on the line IVIV ofFigure II.

Figure V represents a similar section.

al view at right angles vto'Figure'V as on the line VI-V I of Figure II.I

In the drawings, the numeral 1 designates a lower rotating spindle orshaft bearing;

on its upper end a suitable grinding'tool '2 adapted to operativelyengage the lenses 3 carried by my improved lens block vvhich is held incorrectr-elation to the tool as bythe pin or spindle 4;. i As shown, thelensfblock comprises a central or body portion 5 provided with anupstanding collar 6 enclosing the cone socket '7 to receivethelo-wer'jend of the spindle l and having fiextending out wardly fromthe centralfbody portion 5 a plurality of furcatedf'lens engagingmembers, each of said members being s'plitas at 9 and provided withithe'lugs 10 and -11] aid-- jacent the-slot 9. These lugs areadaptedto beconnected as by the clamp screw '12to,

the furcated halves together and se- .curely clamp a lens in i positiononlthe her 8. seat portion 13 having'its upper fac'eofp'rop'er curve tofit exactly the lens to be mounted thereon and solidly support the lens,said portion 13 being peripherally bounded by the upstanding rim orflange 14L so that as the screw 12 is tightened and the parts lOand 11are drawn together the flanges 14 will clampingly engage the edges ofthe lens as is particularly illustrated in connection with Figures IV.and V. By reference to these views it will be seen that the lens isfirmly supported throughout so that there is no possible springing ofthe glass during the grinding operation and it is satisfactorilyclampingly held by edge engagement, leaving the free face to engage andbe operated upon by a suitable grinding tool.

In order that the lens may be best inspected and its thicknessdetermined by the skilled operator, etc., without the necessity ofremoving it, from the block, I coat the upper face of the seat 13 with asuitable layer of material which may be in the form of either pitch,felt, or heavy black paint,

lacquer or the like, which will have a certain softness though rigidity,tending not to scar the glass placed in engagement therewith and willgive a black surface at the back of the lens, the advantage of whichwill be immediately apparent to any lens grinder.

From the foregoing description it will be seen that I have provided animproved con- 75 Said member 8 is [provided "with a they may be readilyinspected as the grind- 1,447 see struction of lens retaining blockadapted to receive .and properly retain a plurality of lenses having theproper shape to support the several lenses in such relation to eachother that all of the lenses will be equally and evenly ground off andwill all be ground to a uniform thickness, in which the lenses may beeasily clamped in position or disengaged as desired, and in whichthrough the provision of the black backing therefor ing operationprogresses.

I claim: I

1. A lens block comprising a body portion having a plurality of furcatedarms extending outwardly therefrom, said arms having lens seat portionsand lens clamping projections on the arms adjacent the seats and meansfor drawing the furcations together to clampingly secure lenses inposition on the seats.

2. A lens block comprising a body portion, a plurality of split armsradiating therefrom, said arms being of resilient material, said armshaving lens receiving recesses formed therein, and means for springingthe split portions of the arms together to clampingly secure a lens inposition in the recess.

3. A lens block comprising a body tion having a plurality of outwardlyextending split arms each formed on one face with a lens receiving seatand adjacent lens edge porengaging portions, and means on the oppositeface for drawing portions of the arm together to clampingly secure alens in position on the seat and retained by the edge engaging portions.

4:. A device of the character described comprising a body portion havinga plurality of radiating split arm members, each of said arm membershaving a. recess formed in one face of curve to fit the face of a lensand having at the sides of the recess upstanding flange portions adaptedtoengage the edge of a lens, and means for springing the arm sectionstogether to clampingly secure a lens in position on the seat.

5. A device of the character described,

comprising abody portion having a plurality of arms, each of said armsbeing centrally sub-divided and of reslllent material,

and having a lens receiving seatv formed on one face thereof, lugsformed on the opposite face of each of the arms, and a clamping deviceengaging the lugs of adjacent sections of each arm for springing theminward to clampingly secure a lens in position on the seat.

In testimony whereof I have affixed my signature, in presence of twowitnesses.

HARRY W. HILL.

